单词：single-resonator laser amplifier
单谐振腔激光放大器
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By Carol Pearson Washington 30 April 2008 Ten years ago, the U.S. Food and Drug Administration approved LASIK, eye surgery with a laser that enables people to see without glasses. But about five percent of LASIK procedures fail, and those patients ca
发表于:2018-12-08 / 阅读(56) / 评论(0)
VOA常速英语2008年（四月）
VOA常速英语2008年（四月）
This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? Whether it's for streaming Netflix or sharing files, we're gobbling up more and more dataand we want it faster. But even shooting data with lasers over fiber-o
发表于:2018-12-24 / 阅读(73) / 评论(0)
Scientific American(五)月
Scientific American(五)月
2 What are the two speakers doing? [A] Walking down a hill [B] Climbing stairs [C] Discussing a trip
发表于:2018-12-30 / 阅读(61) / 评论(0)
听听测测
听听测测
3 Where are the two speakers? [A] In a restaurant [B] On a farm [C] At the man's home
发表于:2018-12-30 / 阅读(60) / 评论(0)
听听测测
听听测测